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18 September 2018 4x4 array of position-sensitive virtual Frisch-grid CdZnTe detectors for imaging and spectroscopy of gamma-ray sources (Conference Presentation)
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Arrays of position-sensitive virtual Frisch-grid CdZnTe (CZT) detectors offer an economical approach to make high-efficiency and high energy-resolution gamma cameras for spectroscopy and imaging of radioactive sources. There are many application areas for such instruments including gamma-ray astronomy, medical and industrial imaging, environmental cleanup, nonproliferation and nuclear safeguards. Here, we present the design and results from testing of a 4x4 array mounted on a fanout substrate coupled to a front-end ASIC. The current array houses up to 16 detectors with a cross section of 6x6 mm3 and thickness of 2 cm. However, the array’s design provides flexibility to extend its dimensions in conjunction with the opportunity to replace faulty individual detectors or higher-performing detectors with thicknesses potentially increased up to 4 cm. Each detector is encapsulated inside an ultra-thin polyester shell and furnished with 5 mm-wide charge-sensing pads placed near the anode. For each gamma-ray event the signals on the pads are converted into X-Y coordinates and combined with the cathode signals (for the Z coordinates) to give 3D positional information of all interaction points, which provides a high-spatial-resolution imaging capability for the array. Moreover, the positional information can be used to correct for the detectors’ response non-uniformities due to the presence of crystalline defects, which, in turn, allows the developers to use relatively economical standard-grade (unselected) CZT crystals, while retaining the high spectroscopic performance comparable to the large-volume pixelated detectors produced from more expensive monolithic CZT crystals.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aleksey E. Bolotnikov, Giuseppe Camarda, Gianluigi De Geronimo, Jack Fried, Diedra Hodges, Anwar Hossain, Luis Ocampo, Ge Yang, Emerson Vernon, and Ralph B. Jamese "4x4 array of position-sensitive virtual Frisch-grid CdZnTe detectors for imaging and spectroscopy of gamma-ray sources (Conference Presentation)", Proc. SPIE 10762, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX, 107620M (18 September 2018);

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